linux-kernel - Re: missing 700 MB of RAM

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Date:	Sun, 21 Nov 2010 21:55:59 -0700
From:	Thomas Fjellstrom <thomas@...llstrom.ca>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Andreas Hartmann <andihartmann@...19freenet.de>,
	linux-kernel@...r.kernel.org
Subject: Re: missing 700 MB of RAM

On November 21, 2010, Jiri Slaby wrote:
> On 11/21/2010 08:02 PM, Andreas Hartmann wrote:
> > I've got 8 GB RAM installed, but linux reports 7,3 GB. Where is the
> > missing RAM (700 MB)?
> 
> ...
> 
> > The motherboard is a GA-MA78GM-S2H (64bit, AMD) with a on board Radeon
> > HD 3200 VGA card. The card uses 256 MB of RAM - so 444 MB of RAM are
> > missing. Where are they gone?
> 
> Hi, ask your BIOS:
> > BIOS-provided physical RAM map:
> > BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
> > BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
> > BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
> > BIOS-e820: 0000000000100000 - 00000000afde0000 (usable)
> > BIOS-e820: 00000000afde0000 - 00000000afde3000 (ACPI NVS)
> > BIOS-e820: 00000000afde3000 - 00000000afdf0000 (ACPI data)
> > BIOS-e820: 00000000afdf0000 - 00000000afe00000 (reserved)
> > BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> > BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
> > BIOS-e820: 0000000100000000 - 0000000230000000 (usable)
> 
> It reports 7677M of usable mem. Or maybe your loader is cheating on you?
> I doubt so...
> 
> regards,

I've got the same board, It doesn't seem my map is missing more than a few MB 
out of 2G (gfx reservation is 128MB)

[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
[    0.000000]  BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 0000000077de0000 (usable)
[    0.000000]  BIOS-e820: 0000000077de0000 - 0000000077de3000 (ACPI NVS)
[    0.000000]  BIOS-e820: 0000000077de3000 - 0000000077df0000 (ACPI data)
[    0.000000]  BIOS-e820: 0000000077df0000 - 0000000077e00000 (reserved)
[    0.000000]  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[    0.000000]  BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)

I'm using the F5 bios if it helps any.

-- 
Thomas Fjellstrom
thomas@...llstrom.ca
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